package com.guyaogg.gulimall.seckill.scheduled;

import com.guyaogg.gulimall.seckill.service.SeckillService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * 秒杀商品的定时上架
 * 每天晚上 3 点：上架最近三天需要秒杀的商品
 * 当天 00:00:00 - 23:59:59
 * 明天 00:00:00 - 23:59:59
 * 后天 00:00:00 - 23:59:59
 *
 * @author 顾遥
 */
@Slf4j
@Service
public class SeckillSkuScheduled {

    @Autowired
    SeckillService seckillService;

    @Autowired
    RedissonClient redissonClient;

    private final String uploadLock = "seckill:upload:lock";

    @Scheduled(cron = "0 0 3 * * ?")
    public void uploadSeckillSkuLatest3Days() {
        // TODO 幂等性问题
        // 1.重复上架无需处理
        log.debug("上架秒杀的商品信息");
        // 分布式锁。锁的业务执行完成，状态完成更新，保证业务原子信息
        RLock lock = redissonClient.getLock(uploadLock);
        // 获取锁
        lock.lock(10, TimeUnit.SECONDS);
        try {
            // 临界区
            seckillService.uploadSeckillSkuLatest3Days();
        } finally {
            // 释放锁
            lock.unlock();
        }
    }

}
